Siemens RWD68U Betriebsanleitung

RWD68U

Technical Instructions

Document No. 155-738

January 14, 2005

Universal Controller

Description The Universal Controller is intended for heating, air conditioning, ventilation and

refrigeration in comfort control applications. RWD68U main loop control applications

are designed for temperature, static pressure, humidity, air pressure, fluid pressure,

refrigeration, air quality and air fluid velocity control. The controller contains pre-

programmed applications.

Auxiliary control functions include:

• Day/night setpoints

• Remote setpoint control

• Limiter control

• Cascade control

• Maximum priority

• Setpoint compensation

• Summer/winter operation

Control parameters are adjusted for maximum comfort control via three buttons on the

face of the device, or with a laptop computer and Siemens Building Technologies

program software.

NOTE: For complete supporting technical documentation, including training

presentations, see www.us.sbt.siemens.com/hvp/components.

Features • Stand-alone electronic temperature controller with P or P+I response

• 24 Vac operating voltage

• Control application selectable via Application Number

• Active input scale can be selectable

• Limit and direction of the output scale can be freely assigned

• Two universal inputs for Siemens 1000 ohm nickel (Ni 1000), 1000 ohm platinum

(Pt 1000) temperature sensors and 0 Vdc to 10 Vdc signals

• Unit can be set as °F, °C, % or no specified unit

• One modulating 0 to 10 Vdc signal output, direct or reverse action

• One two-position output, direct or reverse action

• One digital input for day/night changeover

• Entering or changing of all data via operating buttons on the controller, is possible

without additional tools

• Computer connection for downloading pre-programmed applications via the

software tool

Product Number RWD68U

Siemens Building Technologies, Inc.

Technical Instructions RWD68U Universal Controller

Document Number 155-738

January 14, 2005

Accessories ARG62.21 Protective enclosure for wall mounting.

SEH62.1U Program Clock

SHM62.2U 24/120 Vac Transformer

125-3481 RWD Controller Programming Tool (CD)

RWDTKU Tool Kit

Warning/Caution Notations

CAUTION:

Equipment damage may occur if you do not follow a

procedure as specified.

Specifications

Power Supply

Operating voltage 24 Vac + 20%

Frequency 50/60 Hz

Power consumption 3.0 VA

LCD Actual and nominal values Four digits

Setpoint adjustment range -58°F to 302°F (-50°C to 150°C)

Display Resolution

(does not relate to controller

accuracy)

Siemens Ni 1000 ohm 1°F (0.5°C)

Pt 1000 ohm 1°F (0.5°C)

Active sensor Depends on setting range

Environmental Conditions Storage and transport

Temperature -13°F to 158°F (-25°C to 70°C)

Humidity <95% rh

Operation

Temperature 32°F to 122°F (0°C to 50°C)

Humidity <95% rh

Regulatory Approvals Conforms to requirements

UL UL listed to 916 Energy

Management Equipment

Terminals Screw terminals, min./max. conductors Minimum: 24 AWG (1)

Maximum: 16 AWG (2), or 14 AWG (1)

Weight RWD68U Controller 10.72 oz (304 grams)

With packaging 12.64 oz (358 grams)

Analog Inputs X1, X2

Siemens Ni 1000 ohm @ 32°F

(0°C)

Controller measuring range -58°F to 302°F (50°C to 150°C)

Maximum cable length for 14 AWG 984 ft (300 m)

Pt 1000 ohm at 32°F (0°C) Controller measuring range -4°F to 356°F (-20°C to 180°C)

Maximum cable length for 14 AWG 984 ft (300 m)

Analog voltages

(For measured variable in °F.

°C, % or without unit)

Range 0 to 10 Vdc corresponding to

adjustable range from –100 to

8000 (°F, °C, % or no unit)

Maximum cable length for 14 AWG 984 ft (300 m)

Remote setpoint X2 Range 0 to 1000 ohm corresponding to

adjustable range from –100 to

8000 (°C, °F, % or no unit)

Maximum cable length for 14 AWG 984 ft (300 m)

Digital input D1 Polling voltage for control commands (D…M) 15 Vdc

Current consumption <15 mA

Analog outputs Y1, Y2 Range 0 to 10 Vdc

Maximum current +1 mA

Digital output (Q1) Relay contacts (potential-free)

Voltage: 24 Vac

Maximum rating: 24 Vac to 240 Vac

6A RES/5 FLA/30 LRA/1/2 HP

30 Vdc, 4A

Page 2 Siemens Building Technologies, Inc.

RWD68U Universal Controller Technical Instructions

Document Number 155-738

January 14, 2005

Function Summary • Controller

Stand-alone controller with one direct or reverse acting 0 to 10 Vdc output and

one two-position (ON/OFF) output with dependent and independent adjustment

on each sequence for direct acting or reverse acting. Adjustable parameters,

including proportional band and integral action time.

• Auxiliary selectable function

• Universal input X2 for one of the following auxiliary functions:

− P+I limiter function (Absolute and Relative)

− Remote setpoint

− Cascade control

− Setpoint compensation

− Winter/summer operation

− Maximum priority

• Digital input D1 for setpoint changeover day/night

Equipment

Combinations

The following Siemens devices can be connected to RWD68U Universal Controllers.

Other combinations with units from third-party manufacturers are possible, if the

input and output specifications match the RWD68U.

Table 1.

Description Document Number

Sensor with Siemens Ni 1000 temperature sensing element

QAA25U Room temperature sensor with setpoint adjuster

155-330

Differential Pressure Sensor 155-719

GIB Series 310 lb-in Non Spring Return Actuators

GBB Series 177 lb-in Non Spring Return Actuators

155-176P25

155-177P25

GEB Series 132 in-lb Non Spring Return Actuators 155-318P25

GCA Series 142 in-lb Spring Return Actuators 155-173P25

155-174P25

155-175P25

GMA Series 62 in-lb Spring Return Actuators 155-315P25

SKD Valve Actuator with proportional input

SKD Valve Actuator with floating input

155-180P25

155-181P25

SKB/SKC Valve Actuator with proportional input

SKB/SKC Valve Actuator with floating input

155-163P25

155-171P25

SQX Valve Actuator with proportional input

SQX Valve Actuator with floating input

155-182P25

155-186P25

SQS Actuator with proportional input

SQS Actuator with floating input

155-190P25

155-191P25

SSC Actuator with proportional input

SSC Actuator with floating input

155-313P25

155-314P25

SSB Actuator with proportional input

SSB Actuator with floating input

155-192P25

155-195P25

SFA/SFP two-position valve actuators 155-321P25

Electric Rack and Pinion two-position actuator 155-541P25

1/2 to 2-inch two-way globe valves 155-184P25

1/2 to 2-inch three-way globe valves 155-185P25

2-12 to 6-inch two-way flange valves 155-159P25

2-1/2 to 6-inch three-way flange valves 155-160P25

MT Series 1/2 to 1-1/2-inch two-way globe valves 155-196P25

MT Series 1/2 to 1-1/2-inch three-way globe valves 155-197P25

MZ Series 1/2 to 1-inch two-way globe valves 155-198P25

MZ Series 1/2 to 1-inch three-way globe valves 155-199P25

1/2 to 1-inch zone valves 155-320P25

Siemens Building Technologies, Inc. Page 3

Technical Instructions RWD68U Universal Controller

Document Number 155-738

January 14, 2005

Software Tool An optional, user-friendly, Windows® 95 (or later) based software tool for controller

application selection and parameter adjustment is available. It provides you with a

printout of the controller settings. This tool allows controller programming prior to

installation.

Functions

Controller Type

The RWD68U is a stand-alone universal controller, which performs both primary and

auxiliary control functions. The respective mode is defined by entering the

corresponding configuration and setting parameters via the push buttons on the

controller or the software tool.

Main Functions The RWD68U controller can be programmed as follows:

• One sequence: Q1 Reverse or direct acting

• Two sequences: Y1 and Q1 Reverse and direct acting or

Y1 and Q1 Reverse and reverse acting (independent

and dependent control loop) or

Y2 and Q1 Direct and direct acting (independent and

dependent control loop)

NOTE: Direct Acting – As air temperature increases, the control output increases.

Reverse Acting – As air temperature increases, the control output

decreases.

TH0599R3

= TEMPERATURE SENSOR

= AIR DAMPER ACTUATOR

= HEATING COIL

= COOLING COIL

= HEATING OR COOLING COIL (TWO-PIPE)

= FAN OR PUMP

= TIME CLOCK

= REMOTE SET POINT UNIT

= OUTSIDE AIR SENSOR

Figure 1. Frequently Used Symbols in Application Drawings.

TH0746R1

OFF

SD SD

Setpoint

Temp.

Figure 2. Reverse Acting Sequence

(Application 10 to 19).

TH0747R1

OFF

SD SD

Setpoint

Temp.

Figure 3. Direct Acting Sequence

(Application 80 to 89).

TH0748R1

OFF Temp.

Setpoint

Heating Cooling

SD SD

Min V

Ouptut

Voltagee

Max V

Figure 4. Reverse and Direct Acting

Sequences

(Application 40 to 49).

TH0749R1

Min V

Temp.

Setpoint

Heating Cooling

Ouptut

Voltagee

OFF

SD1

SD1 SD1

Max V

Figure 5. Direct Acting Sequences

(Application 50 to 59).

Page 4 Siemens Building Technologies, Inc.

RWD68U Universal Controller Technical Instructions

Document Number 155-738

January 14, 2005

Dependent Control Loops

TH0751R1

Max V

Heating

Temp.

Setpoint

Output

Voltage

OFF

Min V

Figure 6. Two Direct Acting

Sequences

(Application No.: 20 to 29).

TH0750R1

Y1 Max V

Cooling

Temp.

Setpoint

Output

Voltage

OFF

Min V

Figure 7. Two Reverse Acting

Sequences

(Application 60 to 69).

Independent Control Loops

TH0752R1

Min V

Temp.

Setpoint

Heating Heating

Ouptut

Voltagee

OFF

SD SD

Max V

Figure 8. One Reverse Acting, One

Direct Acting Sequence

(Application 30 to 39).

TH0753R1

Min V Temp.

Setpoint

Cooling Cooling

Ouptut

Voltage

OFF

SD SD

Max V

Figure 9. Two Direct Acting

Sequences

(Application 70 to 79).

Universal Input X1 The primary input for a Siemens Ni 1000 temperature sensor, a Pt 1000 temperature

sensor, or a 0 to 10 Vdc active input.

Universal Input X2 The secondary input for a Siemens Ni 1000 temperature sensor, a Pt 1000

temperature sensor, an active/passive remote setpoint transmitter, or a 0 to 10 Vdc

active input.

Digital Input D1 Selects the day/night changeover. Changeover occurs via potential-free contacts

between D1 and M. Typically, a time clock controls D1 input.

Analog Output Y1 Output Y1 can be configured for either reverse or direct acting. The modulating

voltage output (Y1) controls the devices requiring a 0 to 10 Vdc signal.

Digital Output Q1 Output Q1 can be configured for either reverse or direct acting control.

Example

TH0754R1

Y1Q1

Temp.

X1 Room temperature

Q1 Heating, reverse action

Y1 Cooling, reverse action

Figure 10. Constant Volume with Temperature Control,

Reverse Acting/Reverse Acting.

TH0754R1

Y1Q1

Temp.

X1 Room temperature

Q1 Heating, direct action

Y1 Cooling, direct action

Figure 11. Constant Volume with Temperature Control, Direct Acting/Direct Acting.

Siemens Building Technologies, Inc. Page 5

Technical Instructions RWD68U Universal Controller

Document Number 155-738

January 14, 2005

Auxiliary Functions One of the following auxiliary functions can be selected:

• P+I limiter (Absolute, #x2 and Relative, #x3)

• Remote setpoint, #x1

• Cascade control, #x5

• Setpoint compensation, #x4

• Winter/summer operation, Digital #x6, Analog #x7

• Maximum priority, #x8

• Main loop 0 to 10V input, #x9

Day and night operation mode is also available.

P+I Limiter Function

NOTE: In the following

illustrations, heating

and cooling outputs

are Direct Acting.

Outputs can be

reversed.

TH0755R1

Q1Y1

Temp.

Figure 12. P+I Limiter Function.

The limiter function with P+I control

enables absolute (or relative) maximum

or minimum limitation of the supply air

temperature (X2).

When the value drops below or exceeds

the limiter setpoint, the limiter function

controls and takes priority over the main

setpoint.

Remote Setpoint

NOTE: You cannot select

the remote setpoint

auxiliary function in

Night mode.

TH0756R1

Y1Q1

Temp.

YX2

Figure 13. Remote Setpoint.

A remote setpoint transmitter (QAA25U),

connected to X2 and configured

accordingly, enables setpoint

adjustment.

Active measurement from 0 to 10 Vdc

corresponding adjustable range from

–100 to 8000 units.

Passive measurement from 0 to 1000 Ω

corresponding adjustable range from

–100 to 8000 units.

Cascade Control

TH0757R1

Temp.

Figure 14. X2 Supply Air Temperature

Sensor.

You can select the P+I/P+I room/supply

air temperature cascade control. In this

case, the virtual P+I room temperature

controller determines the setpoint within

the limiter setpoints for the P+I supply air

temperature controller.

Maximum Priority

NOTE: You cannot select

the maximum priority

auxiliary function in

Night mode.

TH0758R1

Temp.

YX1

Figure 15. Maximum Priority,

Cooling.

If the value (0 to 10V) of the input X2 is

greater than the calculated output of the

cooling sequence, the output will use the

X2 input value as output value. This is

active even when the controller is

working with the heating sequence.

Page 6 Siemens Building Technologies, Inc.

RWD68U Universal Controller Technical Instructions

Document Number 155-738

January 14, 2005

Setpoint Compensation

TH0759R1

Y1Q1

Temp.

YX1

Figure 16. Setpoint Compensation.

The temperature setpoint X1 is shifted

by the temperature as measured at

sensor X2.

Configuration of the RWD68U defines

the influence on setpoint X1.

The example shows the room air

temperature setpoint as shifted by the

outside temperature.

Winter/Summer Operation

TH0760R1

Temp.

YX2

Summer

Setpoint Winter

Setpoint

Figure 17. Winter/Summer Operation.

A digital switch or analog input between

terminals X2 and M can be used to

implement winter/summer changeover.

When adjusting setpoints, the heating

setpoint must be less than the cooling

setpoint.

Digital changeover

Summer operation is selected when the

contact is closed. Reverse acting output

(Y1 only) is set to direct action (cooling).

Analog changeover

Summer operation is selected when the

X2 input exceeds the Setpoint. Reverse

acting output (Y1 only) is set to direct

action (cooling).

NOTE: The reverse acting output

changeover occurs in Y1 only

for application numbers 36, 37,

56 and 57; and in Q1 only for

16, 17, 46 and 47.

Day/Night Setpoint

TH0761R1

Temp.

D1 Q1

Figure 18. Day/Night Setpoint.

A contact between terminals D1 and M

can be used to implement setpoint

changeover for day/night operation.

When the contact is open, the setpoints

for day operation are selected.

When the contact is closed, the setpoints

for night operation are selected.

During the night mode, the following

auxiliary functions are disabled: remote

setpoint, absolute/relative limiter,

setpoint compensation, and maximum

priority.

Siemens Building Technologies, Inc. Page 7

Technical Instructions RWD68U Universal Controller

Document Number 155-738

January 14, 2005

Mechanical Design

Protective Housing

ARG62.21

• This UL-approved plastic housing protects the controller when mounted outside a

control panel, such as on ducts, walls and in mechanical rooms. This housing

also prevents inadvertent contact with voltage supplying parts such as the

connecting terminals.

• The RWD68U clips into the housing.

• The cable entries are located at the top and the bottom of the ARG62.21

housing.

• The front has an opening for the LCD display and the programming buttons.

Terminals Plug-in screw terminals

Operating and Display

Elements The RWD68U is operated by the buttons on the controller front. Additional tools are

not necessary. The controller can also be programmed via the software tool, which

plugs into the nine-pin port.

TH0762R1

LCD Display

Software Tool

Nine Pin Port

Program and Display

Function Buttons

Figure 19. RWD68U Universal Controller.

LCD The LCD shows the following information for normal operation:

• Current operating values (maximum four digits)

• Current setpoints (day/night)

• Application number

• Control sequencing diagram

• Auxiliary input value

• Selected auxiliary function

Operating Buttons The controller has three operating buttons for the following functions:

The SELECT ●button is used to enter or save the value adjustment.

The operating buttons are used for viewing and adjusting parameters.

Configuration To configure the controller, follow the instructions supplied with the controller.

Page 8 Siemens Building Technologies, Inc.

RWD68U Universal Controller Technical Instructions

Document Number 155-738

January 14, 2005

Installation Notes The RWD68U Controller can be mounted as follows:

NOTE: Observe all local installation regulations and building codes.

A On a DIN rail at least 4.7 inches (120 mm) long

B Wall-mounted with two screws

C Front-mounted using standard hardware:

• One DIN rail 5.9 inches (150 mm) long

• Two hexagonal blocks 1.97 inches (50 mm)

• Washers and screws

D In the ARG62.21 protective housing

AB C D

TH0550R1

Figure 20. Mounting Options.

Electrical Installation Notes

CAUTION:

• Standard cables can be used for the controller. However, when

mounting in an environment greatly exposed to Electrical Magnetic

Interface (EMI), use only shielded cables.

• The RWD68U is designed for 24 Vac operating voltage.

• Use safety insulating transformers with double insulation; they

must be designed for 100% duty.

• When using several transformers in one system, the connection

terminals G0 (ground) must be galvanically connected.

• Supplying voltages above 24 Vac to low voltage connections may

damage or destroy the controller or any other connected devices.

• Connections to voltages exceeding 24 Vac endanger personal

safety.

• The ARG62.21 Protective Housing does not provide grounding

between conduit connections. Use grounding bushings and jumper

wires or equivalent.

Commissioning Notes A commissioning booklet is included with the RWD68U Controller.

Observe the following:

• The controller must be configured for application-specific operation using the

standard application number.

• Application-specific fine tuning can be performed if required (see the

commissioning booklet).

• Power supply to the controller and the connected devices must be guaranteed.

• Values and settings entered remain available even on power failure.

Siemens Building Technologies, Inc. Page 9

Technical Instructions RWD68U Universal Controller

Document Number 155-738

January 14, 2005

Wiring Diagrams

TH0763R1

G0 Q11

D1 M X1 M X2 M

Q14

Y1 M

Tool

Q12

Figure 21. RWD68U Wiring Diagram.

D1 Digital input

G, G0 24 Vac supply

M Ground (G0) for signal inputs and

universal inputs and analog

outputs

Q11 Common for digital contact

Q12 NC digital contact

Q14 NO digital contact

X1 Signal input (main input: Siemens

Ni 1000, Pt 1000 and

0 to10 Vdc)

X2 Signal input (aux. Input:

Siemens Ni1000, Pt 1000,

0 to10 Vdc and 0 to 1000 Ωor

0 to 10 Vdc remote setpoint)

Y1 Analog output

Tool Communication port for PC

(9-pin plug)

TH0764R1

Y..

BM BM

X1 X2MM

X2X1

24 V SN

24 V SP

TOOL

Q12 Q14

Q11

E1 Electrical load

N1 RWD68U Controller

PC Personal computer

Q1 Potential-free relay contacts for two-position control

S1 Time clock or switch

SN System neutral

SP System potential

X1 Main input (Termination G appears when X1 is an active sensor)

X2 Auxiliary input or remote setpoint (Termination G appears when X2 is an

active sensor)

Y1 Valve actuator/Damper actuator

Figure 22. Connection Diagram.

CAUTION:

If you use a DESKTOP computer, the TOOL signal ground is

galvanically connected to G0 inside the controller. If the signal line of

the computer is grounded to Earth, the G0 line after TOOL connection

will be grounded as well.

Page 10 Siemens Building Technologies, Inc.

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